Can't tell you exactly what size it is but approx. 1 1/2" long and I believe fine threads and around 1/8"dia. I've replaced that turn signal switch once about 4-5 years ago. I looked at my fsm and can't find any reference to it's size. Youtube'd a guy replacing a switch assy and caught a quick glance as he removed that screw. You may have to buy a few screws around those dimensions to fit. When you do find a replacement be sure to use the blue thread locker to keep it tight. Good luck.